Alice and the Unfair Game

binary search, data structures, dp, dsu

Tourism

dfs and similar, dp, dsu, graphs, greedy, trees

Into Blocks (easy version)

data structures, dsu, greedy, implementation, two pointers

Cow and Snacks

dfs and similar, dsu, graphs

Forced Online Queries Problem

data structures, divide and conquer, dsu, graphs, trees

Path Queries

divide and conquer, dsu, graphs, sortings, trees

Unstable String Sort

data structures, dfs and similar, dsu, graphs, greedy, implementation, strings

Daleks' Invasion (hard)

data structures, dsu, graphs, trees

Cover it!

dfs and similar, dsu, graphs, shortest paths, trees

Vicky's Delivery Service

data structures, dsu, graphs, hashing

News Distribution

dfs and similar, dsu, graphs

Special Segments of Permutation

data structures, divide and conquer, dsu, two pointers

0-1-Tree

dfs and similar, divide and conquer, dp, dsu, trees

Extending Set of Points

data structures, divide and conquer, dsu

Edgy Trees

dfs and similar, dsu, graphs, math, trees

Spanning Tree with One Fixed Degree

constructive algorithms, dfs and similar, dsu, graphs, greedy

Power Tree

dfs and similar, dp, dsu, graphs, greedy, trees

Connect

brute force, dfs and similar, dsu

Asya And Kittens

constructive algorithms, dsu

Gourmet choice

dfs and similar, dp, dsu, graphs, greedy

Vasya and Maximum Profit

binary search, constructive algorithms, data structures, dp, dsu

MST Unification

binary search, dsu, graphs, greedy

Make It Connected

dsu, graphs, greedy

Maximum Distance

dsu, graphs, shortest paths, sortings

Alice and Hairdresser

dsu, implementation

Deduction Queries

data structures, dsu

Distinctification

data structures, dsu, greedy

Leaf Sets

data structures, dfs and similar, dsu, graphs, greedy, sortings, trees

Network Safety

dfs and similar, dsu, graphs, math, sortings

Session in BSU

binary search, dfs and similar, dsu, graph matchings, graphs

Mobile Phone Network

dfs and similar, dsu, graphs, trees

Cycle sort

dsu, math

Chemical table

constructive algorithms, dfs and similar, dsu, graphs, matrices

Dominant Indices

data structures, dsu, trees

GCD Counting

divide and conquer, dp, dsu, number theory, trees

AND Graph

bitmasks, dfs and similar, dsu, graphs

Shark

brute force, data structures, dsu, trees

Kuro and GCD and XOR and SUM

binary search, bitmasks, brute force, data structures, dp, dsu, greedy, math, number theory, strings, trees

Cyclic Components

dfs and similar, dsu, graphs

Visible Black Areas

data structures, dsu, geometry, trees

Mahmoud and Ehab and the message

dsu, greedy, implementation

Iqea

data structures, dfs and similar, divide and conquer, dsu, shortest paths, trees

Love Rescue

dfs and similar, dsu, graphs, greedy, strings

Shortest Path Queries

bitmasks, data structures, dsu, graphs

SUM and REPLACE

brute force, data structures, dsu, number theory

Connected Components?

data structures, dfs and similar, dsu, graphs

Imbalance Value of a Tree

data structures, dsu, graphs, trees

Coloring a Tree

dfs and similar, dsu, greedy

Bipartite Segments

binary search, data structures, dfs and similar, dsu, graphs, two pointers

Segments Removal

data structures, dsu, flows, implementation, two pointers

Welcome home, Chtholly

data structures, dsu

Envy

data structures, dsu, graphs

Petya and Catacombs

dsu, greedy, implementation, trees

Binary Matrix

dsu

Royal Questions

dsu, graphs, greedy

Sorting the Coins

dsu, implementation, sortings, two pointers

Points, Lines and Ready-made Titles

dfs and similar, dsu, graphs, trees

Forbidden Indices

dsu, string suffix structures, strings

Desk Disorder

combinatorics, dfs and similar, dsu, graphs, trees

Sorting by Subsequences

dfs and similar, dsu, implementation, math, sortings

Imbalanced Array

data structures, divide and conquer, dsu, sortings

Bipartite Checking

data structures, dsu, graphs

Vladik and Entertaining Flags

data structures, dsu, graphs

Weird journey

combinatorics, constructive algorithms, dfs and similar, dsu, graphs

Bear and Friendship Condition

dfs and similar, dsu, graphs

Peterson Polyglot

brute force, dfs and similar, dsu, hashing, strings, trees

The Door Problem

2-sat, dfs and similar, dsu, graphs

Artsem and Saunders

constructive algorithms, dsu, math

Mahmoud and a Dictionary

data structures, dfs and similar, dp, dsu, graphs

Timofey and our friends animals

data structures, divide and conquer, dsu

Timofey and a tree

dfs and similar, dp, dsu, graphs, implementation, trees

PolandBall and Forest

dfs and similar, dsu, graphs, interactive, trees

New Year and Snowy Grid

dfs and similar, dsu, graphs, interactive

Arpa's weak amphitheater and Mehrdad's valuable Hoses

dfs and similar, dp, dsu

Drivers Dissatisfaction

data structures, dsu, graphs, trees

Socks

dfs and similar, dsu, graphs, greedy

st-Spanning Tree

dsu, graphs, greedy, implementation

Lakes in Berland

dfs and similar, dsu, graphs, greedy, implementation

Destroying Array

data structures, dsu

Digit Tree

dfs and similar, divide and conquer, dsu, trees

Fix a Tree

constructive algorithms, dfs and similar, dsu, graphs, trees

...Wait for it...

data structures, dsu, trees

Swaps in Permutation

dfs and similar, dsu, math

Dividing Kingdom II

brute force, data structures, dsu, graphs, sortings

Bear and Square Grid

dfs and similar, dsu, implementation

Correct Bracket Sequence Editor

data structures, dsu, strings

New Reform

data structures, dfs and similar, dsu, graphs, greedy

Polycarp and Hay

dfs and similar, dsu, graphs, greedy, sortings

Pursuit For Artifacts

dfs and similar, dsu, graphs, trees

Bear and Forgotten Tree 2

dfs and similar, dsu, graphs, trees

Clockwork Bomb

data structures, dfs and similar, dsu, greedy, trees

Table Compression

dfs and similar, dp, dsu, graphs, greedy

Island Puzzle

dfs and similar, dsu, graphs, trees

Minimum spanning tree for each edge

data structures, dfs and similar, dsu, graphs, trees

Pastoral Oddities

data structures, divide and conquer, dsu, math, trees

Moodular Arithmetic

combinatorics, dfs and similar, dsu, math, number theory

Lomsat gelral

data structures, dfs and similar, dsu, trees

Acyclic Organic Compounds

data structures, dfs and similar, dsu, hashing, strings, trees

Campus

binary search, data structures, dsu, trees

Restructuring Company

data structures, dsu